package com.jiangzhe.product.service.impl;

import com.jiangzhe.product.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.jiangzhe.common.utils.PageUtils;
import com.jiangzhe.common.utils.Query;

import com.jiangzhe.product.dao.CategoryDao;
import com.jiangzhe.product.entity.CategoryEntity;
import com.jiangzhe.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService{

    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1.查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);

        //2.组装成父子的树形结构
        //2.1 找到所有的一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter(categoryEntity ->
            categoryEntity.getParentCid() == 0
        ).map((menu)->{
            menu.setChildren(getChildrens(menu,entities));
            return menu;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
    }).collect(Collectors.toList());


        return level1Menus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 1.检查当前删除的菜单，是否被别的地方引用
        //逻辑删除,区别物理删除

        baseMapper.deleteBatchIds(asList);
    }

    /**
     * 找到catelogId的完整路径，实现类
     * @param catelogId
     * @return
     */
    @Override
    public Long[] findCategoryPath(Long catelogId) {
        List<Long> path = new ArrayList<>();
        List<Long> parentPath = findParentPath(catelogId, path);

        Collections.reverse(parentPath);

        return parentPath.toArray(new Long[parentPath.size()]);
    }

    /**
     * 级联更新所有关联的数据
     * @param
     */
    @Transactional
    @Override
    public void updateCascade(CategoryEntity category) {
        this.updateById(category);

        if (!StringUtils.isEmpty(category.getName())){

            //同步更新其他关联表中的数据
            categoryBrandRelationService.updateCascade(category.getCatId(), category.getName());

            //TODO 更新其他关联

        }

    }

    private List<Long> findParentPath(Long catelogId, List<Long> paths){

        //1.收集当前节点id
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if (byId.getParentCid() != 0) {
            findParentPath(byId.getParentCid(),paths);

        }
        return paths;
    }

    //递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid().equals(root.getCatId());
        }).map(categoryEntity -> {
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            //1.菜单的排序
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return children;
    }


}